Modifying Backups?

Is there any way to modify the backups iTunes makes of your iPod? The reason I ask is because I recently got the 2nd Gen iPod and I restored it from the backup of my first gen, and my custom carrier name , and the emoji keyboard I enabled are both still there. So if there is a way to modify the backups it would allow you to make at least some limited customizations/hacks to the 2nd Gen iPod touch. Any ideas?

I'm not sure on the specifics, but I know that it would be unsigned code that would be denied by the signature check. That's basically what jailbreaking over rides. Finding an exploit that allows unsigned code to be parsed.